[SI-LIST] Power supply inductors and EMI beads

Hello all,
   I'm a relatively new engineer still wet behind the ears with this EMI and 
noise stuff.  I'm trying to figure out where is and is not an appropriate place 
to put power choke coils, power filtering, and EMI beads.  I have a board I'm 
putting an FPGA on with some other stuff which generates a moderate amount of 
digital noise, along with my regulators to get my 12V input down to 5/3.3/1.5V. 
 Should I be putting a choke coil on the power supply + input only or the 
ground (-) input also?  Should I tie my signal ground to chassis ground with my 
mounting hardware?  Are EMI supression beads appropriate for both power and 
ground inputs from the supply?  I apologize if these are really basic or "dumb" 
questions but I can't seem to figure this out.

 Thanks, 
   Alex





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